It has been proved that ...
Their quality service has been proved.
show something is true - to show that something is true by providing facts, information etc
You’re wrong, and I can prove it.
Tests have proved that the system works.
I knew he had done it, but there was no way I could prove it to Eddie.
He claims the police destroyed records that could prove the officer’s guilt.
They say I’m too old, but I’m going to prove them all wrong.
To prove his point ( = show that he was right), he mentioned several other experiments which had produced similar results.